JP2015205311A - Contact chip removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact chip removing device configured to prevent a welding torch from being failed even when repeating removal of contact chips from the welding torch.SOLUTION: With a welding torch 10 being fastened by torch fastening means 13, a rotation shaft 4 moves up rotation means 12 in a rotation state toward the torch fastening means 13 by ascending operation of a piston rod 6a in a first fluid pressure cylinder 6, and a contact chip 11 is inserted into a hollow portion 40 from a tip side, so as to externally fit an inner peripheral surface of the hollow portion 40 to the tip side of the contact chip 11 and to rotate the contact chip 11 together with the rotation shaft 4 and remove the chip from the tip of the welding torch 10.

Description

  The present invention relates to a contact tip removing device that removes a contact tip screwed to a tip of a welding torch for arc welding from a welding torch.

  Conventionally, for example, Patent Document 1 discloses an exchanging apparatus that automatically replaces the contact tip in order to efficiently replace the contact tip screwed and connected to the tip of a welding torch for arc welding.

  The exchange device includes a wrench having a recess opened at an upper end, and the wrench is rotated around a rotation axis that is directed in the vertical direction by a drive motor. Then, the welding torch descends while rotating the wrench in a state where the tip of the contact tip faces downward so that the center axis of the contact tip coincides with the rotational axis of the wrench. Then, the contact tip is inserted into the recess from the front end side so that the recess is fitted to the front end side of the contact tip, and the contact tip is rotated together with the wrench to be removed from the welding torch. ing.

Japanese Patent Laid-Open No. 11-347731

  However, in the exchange device of Patent Document 1, the center axis of the contact tip is aligned with the rotational axis of the wrench by inserting a welding torch from above into a cylindrical guide portion provided above the wrench. The center axis of the contact tip and the rotational axis of the wrench are not completely aligned due to the gap formed between the guide portion and the welding torch, and the center axis of the contact tip is likely to vary. By repeating the detaching operation in a state where the rotational axis of the wrench is deviated, an unnecessary load is applied to the screwed portion with the contact tip at the tip of the welding torch, and the screw thread on the welding torch side may be crushed.

  The present invention has been made in view of the problems to be solved, and an object of the present invention is to provide a contact tip removing device that does not cause a failure of the welding torch even if the contact tip is repeatedly removed from the welding torch. .

  In order to achieve the above object, the present invention is characterized in that the welding torch is fixed at a predetermined position on the apparatus fixing side when the contact tip is removed.

  Specifically, the following solution was taken for a contact tip removal device that rotates a contact tip screwed to the tip of the welding torch around its central axis and removes it from the welding torch.

  That is, in the first aspect of the invention, there is provided a rotating means having a rotating body whose center of rotation is directed in the vertical direction, a hollow portion having an opening at the upper end formed inside at least the upper end side of the rotating body, and above the rotating means. A torch fixing means provided to fix the welding torch in a posture in which the tip of the contact tip faces downward, and to move the rotating means up and down; and a torch fixing means for aligning the center axis of the contact tip with the rotational axis of the rotating body Lifting and lowering means, and in a state where the welding torch is fixed by the torch fixing means, the rotating means in a rotating state is lifted toward the torch fixing means by the lifting operation of the lifting means. The hollow tip inner peripheral surface is brought into pressure contact with the contact tip outer peripheral surface by inserting the contact tip into the portion from the tip side, or the hollow portion inner peripheral surface The contact tip distal end side so fitted together to and, the contact tip rotates together with the rotating body, characterized in that removal from the welding torch tip.

  According to a second invention, in the first invention, the hollow portion is provided with a slide bar that is slidable in the vertical direction, and a biasing means that biases the slide bar upward. When the contact tip is inserted into the hollow portion, it is pressed against the contact tip and slides downward against the urging force of the urging means, while the contact tip is removed from the welding torch, The contact tip is configured to slide upward by the urging force of the urging means and push out the contact tip from the hollow portion.

  In a third invention, in the first or second invention, the torch fixing means includes a fluid pressure cylinder having a piston rod that expands and contracts in the horizontal direction, and one end fixed to the tip of the piston rod. A pair of elongated holes extending at an angle so as to be separated from each other in a horizontal direction while gradually moving away from the cylinder are opposed to each other so as to correspond to the elongated holes. When the piston rod is extended with the welding torch set between the block pieces, the pins are inserted into the long holes. As the guide blocks approach each other, the two block pieces approach each other to clamp and fix the welding torch, while the two block pieces fix the welding torch. In the contracted the piston rod, characterized in that each pin is adapted to open the welding torch the both block piece is separated by separating from each other are guided to the respective long holes.

  According to a fourth invention, in the third invention, a horizontal plate in which a wire insertion hole into which a welding wire jumping out from the tip of the contact tip can be inserted is formed in a vertical direction, and the lower surface of the horizontal plate is slidably contactable. A wire cutter is provided that is fixed to the upper surface of the link member and traverses the lower opening of the wire insertion hole when the piston rod expands and contracts.

  In a fifth invention, in the third or fourth invention, a concave portion that extends in the vertical direction and is open at both ends in the vertical direction is formed on the opposing surfaces of the both block pieces. When both the block pieces are brought close to each other with the cylindrical torch nozzle in the welding torch positioned between the two block pieces, the half-circumferential portion of the torch nozzle is externally fitted.

  According to a sixth aspect of the invention, in the invention according to any one of the first to fifth aspects, when the contact tip is inserted into the hollow portion on the inner peripheral surface of the hollow portion, the middle portion of the contact tip The engaging surfaces facing each other are arranged in parallel on a flat surface formed in parallel with the central axis on the outer peripheral surface of the outer peripheral surface.

  In the first invention, even if the contact tip removal operation is repeated, the central axis of the contact tip attached to the welding torch is always the same position immediately before the contact tip is removed. Therefore, even if the contact tip is rotated around its central axis during the contact tip removal operation, an unnecessary load is not applied to the welding torch, and the welding torch does not break down.

  In the second invention, the contact tip is automatically removed from the hollow portion of the rotating body by the slide operation of the slide bar at substantially the same timing as the contact tip is removed from the welding torch. Therefore, the time until the next contact chip removal operation is shortened, and a highly efficient contact chip removal apparatus can be obtained.

  In the third aspect of the invention, the clamping operation of the pair of block pieces for fixing the welding torch is performed by one drive source. Therefore, it is not necessary to prepare a drive source for each block piece, and the equipment is simple. In addition, the apparatus can be made at a low cost and a compact size.

  In the fourth invention, since the wire cutter for cutting the welding wire is driven using the driving source for driving the torch fixing means, it is not necessary to prepare a separate driving source only for cutting the welding wire, and the equipment is A simple, low-cost and compact device can be obtained.

  In the fifth invention, when the welding torch is fixed by the pair of block pieces, the welding torch is not displaced not only in the parallel direction of both block pieces but also in the horizontal direction intersecting the parallel direction of both block pieces. Therefore, even if the sandwiching operation of the welding torch is repeatedly performed with both block pieces, the center axis of the contact tip can be reliably aligned with the rotation axis of the rotating body.

  In the sixth aspect of the invention, when the contact tip threadedly connected to the welding torch is rotated around its central axis, each engaging surface of the rotating body is caught (engaged) with each flat surface of the contact tip. The tip can be reliably rotated with the rotating shaft and removed from the welding torch.

It is a perspective view of the contact chip removal apparatus which concerns on embodiment of this invention. (A) is sectional drawing in the AA of FIG. 1, (b) is a B arrow directional view of (a). It is a perspective view of the contact tip removed from a welding torch. FIG. 3 is a view corresponding to FIG. 2A immediately before cutting the tip of the welding wire. It is a figure which shows the state immediately after cut | disconnecting the front-end | tip of a welding wire after the state of FIG. It is a figure which shows the state immediately after setting the welding torch between both block pieces after the state of FIG. It is sectional drawing in the CC line of FIG. FIG. 7 is a diagram showing a state immediately after the block of FIG. 6 is brought close to each other and the welding torch is gripped and fixed. It is sectional drawing in the DD line | wire of FIG. It is a figure which shows the state immediately after removing the contact tip from the welding torch after the state of FIG. It is a figure which shows the state immediately after removing the contact chip from the rotary body after the state of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  1 and 2 show a contact chip removal apparatus 1 according to an embodiment of the present invention. This contact tip removing device 1 is a welding torch 10 used when welding a steel plate or the like by arc welding, and a copper contact tip 11 (see FIG. 3) screwed and connected to the tip of the welding torch 10 It is for rotating around the central axis and removing it from the welding torch 10.

  The welding torch 10 includes a columnar torch main body 10a, and a cylindrical torch nozzle 10b is mounted on the tip side of the torch main body 10a.

  The torch body 10a is formed with a first guide hole 10d extending along its central axis, and a welding wire W can be inserted into the first guide hole 10d.

  In the center of the front end surface of the torch body 10a, a chip mounting recess 10c having a female screw threaded on the inner surface is formed as a recess.

  As shown in FIG. 3, the contact tip 11 has a long and narrow bar shape and is formed with a second guide hole 11a extending along the central axis. The welding wire W can be inserted into the second guide hole 11a. It has become.

  A portion extending from the midway part to the tip part of the outer peripheral surface of the contact chip 11 has a tapered shape that gradually decreases in diameter as it goes to the tip of the contact chip 11. Two flat surfaces 11b are formed in parallel with the central axis in between.

  At the base end of the contact tip 11, a spiral portion 11c having a male screw threaded on its outer peripheral surface protrudes, and the spiral portion 11c is screwed into the tip mounting recess 10c so as to be attached to the welding torch 10. The contact tip 11 is connected so that the second guide hole 11a coincides with the first guide hole 10d, and the contact tip 11 is positioned inside the torch nozzle 10b.

  As shown in FIGS. 1 and 2, the contact chip removing device 1 includes a main body frame 2 that is a skeleton of the contact chip removing device 1, and the main body frame 2 is disposed on an upper side opposed to the vertical direction. A base plate 21 and a lower base plate 22 are provided.

  The upper and lower base plates 21 and 22 are substantially U-shaped in a plan view in which substantially rectangular cutout portions 20a and 20b are formed at positions corresponding to each other.

  Corresponding four corners of the upper and lower base plates 21 and 22 are connected by connecting shafts 23 extending in the vertical direction, and the upper and lower base plates 21 and 22 and the connecting shafts 23 are framed in a substantially rectangular parallelepiped shape. ing.

  On the upper surface of the upper base plate 21, a pair of side plates 24 project upward from the positions along both opposing sides of the notch 20 a.

  The opening side of the opposite notch portion 20a of the projecting ends of the side plates 24 is integrally connected by a substantially strip-shaped horizontal plate 25, and the side plates 24 and the horizontal plate 25 form a substantially portal shape.

  Further, the opening side of the anti-notched portion 20a of the space S formed by being surrounded by the upper base plate 21, both side plates 24 and the horizontal plate 25 is closed by a back plate 26 having a substantially rectangular shape. A through hole 26a is formed through the center.

  Further, at the center of the horizontal plate 25, as shown in FIG. 4, a wire insertion hole 25a through which a welding wire W protruding from the tip of the contact tip 11 can be inserted from above is formed vertically. On the upper peripheral edge of 25a, an annular ridge portion 25b is projected.

  As shown in FIG. 1, a slide body 3 having a substantially cross shape in a front view is disposed between the notches 20a and 20b.

  The slide body 3 includes a cylindrical portion 3a extending in the vertical direction, and a pair of protruding portions 3b protruding symmetrically in the horizontal direction from the outer peripheral surface of the vertical middle portion of the cylindrical portion 3a. On the side, a mounting plate 3c having a substantially rectangular shape is projected in the horizontal direction.

  Each overhang portion 3b is formed with a slide hole 3d penetrating in the vertical direction, and the slide hole 3d is slidable on each of the two connecting shafts 23 provided on the cutout portions 20a and 20b. It is inserted externally.

  As shown in FIG. 2, a rotating shaft 4 (rotary body) extending in the vertical direction protrudes from the upper end side opening of the cylindrical portion 3 a inside the upper half portion of the cylindrical portion 3 a. The rotation shaft 4 is inserted and is rotated around a rotation axis oriented in the vertical direction by a pair of bearings Be spaced apart in the vertical direction inside the cylindrical portion 3a.

  Further, a drive motor 5 for rotating the rotary shaft 4 is disposed inside the lower half portion of the cylindrical portion 3a, and the lower portion of the drive motor 5 is an opening on the lower end side of the cylindrical portion 3a. It protrudes downward from.

  A hollow portion 40 is formed in the rotary shaft 4 so as to extend over the entire vertical direction of the rotary shaft 4.

  The upper part of the hollow part 40 is open, and the contact chip 11 can be inserted into the hollow part 40 from the opening part from the tip side.

  The opening portion of the hollow portion 40 has a substantially elliptical shape in plan view, and extends symmetrically outward in the radial direction across the rotation center of the rotating shaft 4. The contact chip 11 is formed on the inner peripheral surface of the hollow portion 40. When inserted into the hollow portion 40, engaging surfaces 40a facing the respective flat surfaces 11b of the contact chip 11 are arranged in parallel (see FIG. 2B).

  Further, an annular portion 4a protrudes in the middle in the vertical direction of the inner peripheral surface of the rotary shaft 4, and the protruding end of the annular portion 4a has a circular shape in plan view.

  An elongated slide rod 41 is inserted into the hollow portion 40 so as to be slidable in the vertical direction, and the outer peripheral surface near the lower end of the slide rod 41 is formed when the slide rod 41 slides in the vertical direction. It comes in sliding contact with the protruding end.

  An annular projecting portion 41a projecting radially outward is provided on the outer peripheral surface near the upper end of the slide rod 41, and the annular projecting portion 41a is configured so that the rotating shaft is rotated when the slide rod 41 slides in the vertical direction. 4 is in sliding contact with the inner peripheral surface.

  Furthermore, the lower end of the slide bar 41 is provided with a flange portion 41b extending outward in the radial direction.

  A coil spring 42 (biasing means) for urging the slide bar 41 upward via the flange portion 41b is disposed in a region below the annular portion 4a of the hollow portion 40.

  A first fluid pressure cylinder 6 (elevating means) having a piston rod 6a that expands and contracts upward is fixed at a position corresponding to the mounting plate 3c on the upper surface of the lower base plate 22, and the tip of the piston rod 6a is The fixing plate P is fixed to the mounting plate 3c.

  The slide body 3 and the rotating shaft 4 constitute the rotating means 12 of the present invention, and the rotating means 12 is moved up and down as the piston rod 6a of the first fluid pressure cylinder 6 expands and contracts. It has become.

  A substantially block-shaped second fluid pressure cylinder 7 is attached to the side of the back plate 26 opposite to the space S, and the piston rod 7a of the second fluid pressure cylinder 7 enters the space S through the through hole 26a. It is designed to expand and contract horizontally.

  The space S is provided with a substantially U-shaped link member 8 in a plan view in which the opposite side of the second fluid pressure cylinder 7 opens.

  As shown in FIGS. 7 and 9, the link member 8 is divided into two parts in a short prismatic base portion 81 whose central axis extends in the horizontal direction and in a direction intersecting with the expansion / contraction direction of the piston rod 7a from the base portion 81. And a pair of plate portions 82 extending to the side opposite to the second fluid pressure cylinder 7, and the base portion 81 (one end of the link member 8) is fixed to the tip of the piston rod 7a.

  Further, a long hole 82 a is formed on the side of the plate portion 82 opposite to the second fluid pressure cylinder 7 (the other end side of the link member 8). Incliningly extending away from each other while gradually moving away from each other.

  Furthermore, inclined surface portions 82b extending along the long holes 82a formed in the plate portions 82 are formed on the opposing sides of the plate portions 82.

  In the area of the space S not covered by the horizontal plate 25, as shown in FIG. 1 and FIG. 2, the pair of block pieces 9 are arranged apart from each other in the horizontal direction intersecting the expansion and contraction direction of the piston rod 7a. ing.

  Slide holes 9a are formed in the horizontal direction intersecting the expansion / contraction direction of the piston rod 7a at positions spaced apart in the expansion / contraction direction of the piston rod 7a in the upper and lower portions of the block pieces 9, respectively.

  Slide pins 24a corresponding to the slide holes 9a of the block pieces 9 project from the opposing surfaces of the side plates 24, and the slide pins 24a are slidably fitted into the slide holes 9a. Thus, both the block pieces 9 can move in the approaching direction and the separating direction.

  On the opposing surfaces of the both block pieces 9, concave portions 91 extending in the vertical direction and open at both ends in the vertical direction are formed to be concave at positions facing each other.

  As shown in FIGS. 7 and 9, the recess 91 is a continuous connection between a pair of inclined surfaces 91a approaching each other toward the side plate 24 and edges of the inclined surfaces 91a on the side plate 24 side. When the welding torch 10 is set between the block pieces 9 and the block pieces 9 are brought close to each other, the recessed portion 91 becomes a half circumference of the torch nozzle 10b. The two inclined surfaces 91a and the continuous surface 91b are brought into contact with three points in the circumferential direction in the half-circumferential portion of the torch nozzle 10b by being externally fitted to the portion.

  A concave groove 92 that opens to the side plate 24 side and the second fluid pressure cylinder 7 side is formed in the middle in the vertical direction of each block piece 9. A plate portion 82 is inserted. That is, the block pieces 9 are arranged to face each other so as to correspond to the long holes 82a.

  The groove bottom surface 92 a of the concave groove 92 is inclined so as to correspond to the inclined surface portion 82 b of the plate portion 82 fitted into the concave groove 92.

  Further, the concave groove 92 of each block piece 9 is provided with a pin 93 extending in the vertical direction and fitted into the elongated hole 82a, and the pin 93 is movable in the extending direction of the elongated hole 82a. It has become.

  The second fluid pressure cylinder 7, the link member 8, and the block pieces 9 constitute the torch fixing means 13 of the present invention, and the welding torch 10 is placed between the block pieces 9 and the contact tips. When the piston rod 7a is extended in a state where the tip of 11 is set to face downward, as shown in FIGS. 6 to 9, the pins 93 are guided by the long holes 82a and approach each other. When both block pieces 9 approach each other and each recessed portion 91 is fitted outside the torch nozzle 10b, the welding torch 10 is sandwiched and fixed, and the central axis of the contact tip 11 is the rotational axis of the rotary shaft 4. It comes to match the heart.

  In the state where the welding torch 10 is fixed by the torch fixing means 13, the rotating means 12 with the rotating shaft 4 in the rotating state is moved upward by the piston rod 6 a in the first fluid pressure cylinder 6. 13, the contact tip 11 is inserted into the hollow portion 40 from the front end side so that the engagement surfaces 40 a of the hollow portion 40 are made flat on the contact tip 11 as shown in FIG. 10. The contact tip 11 faces the surface 11b and is rotated together with the rotary shaft 4 to be removed from the tip of the welding torch 10.

  Further, when the contact tip 11 is inserted into the hollow portion 40, the slide bar 41 is pressed by the contact tip 11 and slides downward against the urging force of the coil spring 42, while the contact tip 41 When the 11 is removed from the welding torch 10, as shown in FIG. 11, the contact tip 11 is pushed out from the hollow portion 40 by sliding upward by the urging force of the coil spring 42.

  On the other hand, when the piston rod 7a is contracted in a state where the welding torch 10 is fixed by the block pieces 9, the pins 93 are guided by the long holes 82a and separated from each other, so that the block pieces 9 are The welding torch 10 is opened at a distance.

  As shown in FIG. 4, a block-shaped wire cutter 83 is fixed to the upper surface of the base 81 of the link member 8, and the edge of the upper surface on the side opposite to the second fluid pressure cylinder 7 is a cutting blade. 83a.

  When the piston rod 7a expands and contracts, the wire cutter 83 crosses the lower opening of the wire insertion hole 25a while sliding on the lower surface of the horizontal plate 25. As shown in FIG. When the piston rod 7a is extended with the welding wire W protruding from the contact tip 11 inserted into the wire insertion hole 25a, the welding is performed between the lower peripheral edge of the wire insertion hole 25a and the cutting edge 83a of the wire cutter 83. The wire W is cut.

  Next, the removal operation | work of the contact chip | tip 11 using the said contact chip | tip removal apparatus 1 is demonstrated.

  First, after the arc welding operation to the steel plate or the like by the welding torch 10 is finished, the welding torch 10 is moved above the wire insertion hole 25a of the contact tip removing device 1 by an industrial robot (not shown) and is put on standby. .

  Next, as shown in FIG. 4, the welding wire W that jumps out from the tip of the contact tip 11 is inserted into the wire insertion hole 25a from above.

  Thereafter, the piston rod 7a of the second fluid pressure cylinder 7 is extended. Then, as shown in FIG. 5, the wire cutter 83 crosses the lower opening of the wire insertion hole 25a while slidingly contacting the lower surface of the horizontal plate 25, and a ball-shaped portion W1 formed at the tip of the welding wire W. Is cut between the lower opening edge of the wire insertion hole 25a and the cutting edge 83a of the wire cutter 83.

  Thereafter, the piston rod 7a of the second fluid pressure cylinder 7 is contracted and the welding wire W is drawn into the welding torch 10 so that the welding wire W is not positioned in the second guide hole 11a. 7, the welding torch 10 is moved by an industrial robot (not shown), and the torch nozzle 10 b portion is set between the block pieces 9 with the tip of the contact tip 11 facing downward.

  Next, the piston rod 7a of the second fluid pressure cylinder 7 is extended again. Then, as shown in FIGS. 8 and 9, the pins 93 of the block pieces 9 are guided by the long holes 82 a of the link member 8 and approach each other, whereby the block pieces 9 approach each other. The torch nozzle 10 b is sandwiched and fixed by the recessed portions 91 of the both block pieces 9, so that the center axis of the contact tip 11 coincides with the rotational axis of the rotating shaft 4.

  Thereafter, the drive motor 5 is rotationally driven in the X direction (see FIG. 10) to rotate the rotary shaft 4 and extend the piston rod 6a of the first fluid pressure cylinder 6. Then, the contact tip 11 attached to the welding torch 10 from the upper end opening of the rotating shaft 4 is gradually inserted into the hollow portion 40, and the slide bar 41 is pressed against the contact tip 11 to resist the biasing force of the coil spring 42. Slide down gradually.

  Further, when the piston rod 6a of the first fluid pressure cylinder 6 is extended, both engaging surfaces 40a formed on the inner peripheral surface of the upper end opening of the rotating shaft 4 face both the flat portions 11b of the contact tip 11, and the above-mentioned The contact tip 11 rotates around the central axis together with the rotary shaft 4 and is detached from the welding torch 10.

  Thereafter, the piston rod 6a of the first fluid pressure cylinder 6 is contracted. Then, the coil spring 42 slides the slide bar 41 upward with its urging force, and is removed from the welding torch 10 and inserted into the hollow portion 40 by the slide operation of the slide bar 41 upward. The contact tip 11 is pushed out from the upper end opening of the hollow portion 40.

  Thereafter, the piston rod 7a of the second fluid pressure cylinder 7 is contracted. Then, the pins 93 of the block pieces 9 are guided by the long holes 82a of the link member 8 and separated from each other, whereby the block pieces 9 are separated from each other and the torch nozzle 10b is opened.

  Then, when the industrial robot (not shown) moves the welding torch 10 to the contact tip attaching step, the removal operation of the contact tip 11 using the contact tip removing device 1 is completed.

  As described above, according to the embodiment of the present invention, even if the removal operation of the contact tip 11 is repeated, the central axis of the contact tip 11 attached to the welding torch 10 is always the same position immediately before the contact tip 11 is removed. . Therefore, even when the contact tip 11 is rotated around the central axis during the removal operation of the contact tip 11, no unnecessary load is applied to the welding torch 10, and the welding torch 10 does not break down.

  Further, the contact tip 11 is automatically removed from the hollow portion 40 of the rotating shaft 4 by the slide rod 41 and the coil spring 42 by the slide operation of the slide rod 41 at substantially the same timing as the contact tip 11 is removed from the welding torch 10. Therefore, the time until the removal work of the contact chip 11 to be removed next is shortened, and a highly efficient contact chip removal apparatus 1 can be obtained.

  Further, since the clamping operation of the pair of block pieces 9 for fixing the welding torch 10 is performed by one drive source, it is not necessary to prepare a drive source for each block piece 9 and the equipment is simple. In addition, the contact chip removing device 1 can be made at a low cost and a compact size.

  Furthermore, since the wire cutter 83 that cuts the welding wire W is driven using a drive source that drives the torch fixing means 13, it is not necessary to prepare a separate drive source only for cutting the welding wire W, and the equipment A simple and low-cost and compact contact chip removing device 1 can be obtained.

  In addition, when the welding torch 10 is fixed with the pair of block pieces 9, the both concave recesses 91 are externally fitted to the welding torch 10, so that the welding torch 10 is only in the direction in which the block pieces 9 are arranged side by side. In addition, there is no deviation in the horizontal direction intersecting with the parallel arrangement direction of the block pieces 9. Therefore, even if the sandwiching operation of the welding torch 10 is repeatedly performed by both the block pieces 9, the center axis of the contact tip 11 can be reliably aligned with the rotation axis of the rotation shaft 4.

  Then, when the contact tip 11 screwed and connected to the welding torch 10 is rotated around its central axis, each engaging surface 40a of the rotating shaft 4 is hooked (engaged) with each flat surface 11b of the contact tip. The contact tip 11 can be reliably rotated together with the rotating shaft 4 and removed from the welding torch 10.

  In the embodiment of the present invention, the contact tip 11 is rotated together with the rotary shaft 4 by externally fitting the inner peripheral surface of the hollow portion 40 of the rotary shaft 4 to the distal end side of the contact tip 11. For example, the contact tip 11 may be rotated together with the rotary shaft 4 by pressing the inner peripheral surface of the hollow portion 40 of the rotary shaft 4 to the outer peripheral surface of the contact tip 11.

  In the embodiment of the present invention, the hollow portion 40 of the rotating shaft 4 is formed over the entire vertical direction of the rotating shaft 4, but is not limited thereto, and may be formed at least inside the upper end side. .

  Further, in the embodiment of the present invention, the approach / separation operation of both the block pieces 9 and the cutting operation of the wire cutter 83 are driven by one drive source (second fluid pressure cylinder 7). Alternatively, it may be driven by separate drive sources.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a contact tip removing device that removes a contact tip that is screwed and connected to the tip of a welding torch for arc welding from the welding torch.

1 Contact chip removal device 4 Rotating shaft (Rotating body)
6 First fluid pressure cylinder (lifting means)
7 Second fluid pressure cylinder 7a Piston rod 8 Link member 9 Block piece 10 Welding torch 10b Torch nozzle 11 Contact tip 11b Flat surface 12 Rotating means 13 Torch fixing means 25 Horizontal plate 25a Wire insertion hole 40 Hollow portion 40a Engaging surface 41 Slide rod 42 Coil spring (biasing means)
82a Long hole 83 Wire cutter 91 Recessed portion W Welding wire

Claims (6)

A contact tip detaching device that rotates a contact tip screwed to the tip of the welding torch around its central axis and removes it from the welding torch,
Rotating means having a rotating body whose center of rotation is directed in the vertical direction, and having a hollow portion opened at the upper end inside at least the upper end side of the rotating body;
A torch fixing means provided above the rotating means and fixing the welding torch in a posture in which the tip of the contact tip is directed downward to align the central axis of the contact tip with the rotational axis of the rotating body;
Elevating means for elevating and lowering the rotating means,
With the welding torch fixed by the torch fixing means, the rotating means in a rotating state of the rotating body is raised toward the torch fixing means by the lifting operation of the elevating means, and the contact tip is placed in the hollow portion. By inserting from the front end side, the inner peripheral surface of the hollow portion is brought into pressure contact with the outer peripheral surface of the contact chip, or the inner peripheral surface of the hollow portion is externally fitted to the front end side of the contact chip, and the contact chip is A contact tip detaching device, wherein the contact tip detaching device is rotated together with a rotating body and is detached from the tip of the welding torch. The contact chip removing device according to claim 1,
The hollow part is provided with a slide bar slidable in the vertical direction and a biasing means for biasing the slide bar upward,
When the contact tip is inserted into the hollow portion, the slide rod is pressed against the contact tip and slides downward against the urging force of the urging means, while the contact tip is removed from the welding torch. A contact tip detaching device configured to slide upward by the urging force of the urging means and push out the contact tip from the hollow portion when detached. In the contact chip removing device according to claim 1 or 2,
The torch fixing means includes a fluid pressure cylinder having a piston rod that expands and contracts in the horizontal direction;
One end of the piston rod is fixed at one end, and a link member having a pair of elongated holes formed on the other end side while being inclined away from each other in a horizontal direction while gradually moving away from the fluid pressure cylinder;
A pair of block pieces that are arranged to face each of the long holes and have pins that fit into the corresponding long holes so as to be movable in the extending direction;
When the piston rod is extended with the welding torch set between the block pieces, the pins are guided by the long holes and approach each other, so that the block pieces approach and the welding torch is moved. On the other hand, when the piston rod is contracted while the welding torch is fixed by the both block pieces, the pins are guided by the long holes and separated from each other, thereby separating the block pieces. The contact tip removing device is configured to open the welding torch. In the contact chip removal apparatus according to claim 3,
A horizontal plate in which a wire insertion hole into which a welding wire jumping out from the tip of the contact tip can be inserted is formed vertically;
And a wire cutter that is fixed to the upper surface of the link member so as to be in sliding contact with the lower surface of the horizontal plate and that crosses the lower opening of the wire insertion hole when the piston rod expands and contracts. External device. In the contact chip removing device according to claim 3 or 4,
On the opposing surfaces of the both block pieces, a recess is formed that extends in the vertical direction and is open at both ends in the vertical direction.
The recessed portion is externally fitted to a half-circumferential portion of the torch nozzle when the block pieces are brought close to each other with the cylindrical torch nozzle in the welding torch positioned between the block pieces. Contact chip removal device. In the contact chip removing device according to any one of claims 1 to 5,
On the inner peripheral surface of the hollow portion, when the contact chip is inserted into the hollow portion, the engagement faces the flat surface formed parallel to the outer peripheral surface of the middle portion of the contact chip with the central axis in between. A contact chip removing device, wherein the surfaces are arranged side by side.

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